Production of hydrogen by ultraviolet irradiation of Mo/sub 2/(SO/sub 4/)/sub 4//sup 4 -/ in aqueous sulfuric acid. Electronic absorption spectrum of K/sub 3/MO/sub 2/(SO/sub 4/)/sub 4/. 3. 5H/sub 2/O at 15 K. [15/sup 0/K]
Ultraviolet irradiation (lambda 254 nm) of Mo/sub 2/(SO/sub 4/)/sub 4//sup 4 -/ in 5 M H/sub 2/SO/sub 4/ produces H/sub 2/ and the one-electron oxidation product Mo/sub 2/(SO/sub 4/)/sub 4//sup 3 -/. The disappearance quantum yield of Mo/sub 2/(SO/sub 4/)/sub 4//sup 4 -/ is 0.17 at 254 nm. The spectrum of K/sub 3/Mo/sub 2/(SO/sub 4/)/sub 4/ . 3.5H/sub 2/O exhibits an absorption band at 1405 nm epsilon 143); this band shows a vibrational progression in a 350-cm/sup -1/ fundamental even in 5 M D/sub 2/SO/sub 4/ solution at room temperature. At 15 K additional vibronic structure is resolved. This band is assigned to the N ..-->.. E type transition delta ..-->.. delta* (/sup 2/B/sub 2g/ ..-->.. /sup 2/B/sub 1u/).
- Research Organization:
- California Inst. of Tech., Pasadena
- OSTI ID:
- 7211145
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 99:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN
CHEMICAL REACTION YIELD
MOLYBDENUM SULFATES
ABSORPTION SPECTRA
INFRARED SPECTRA
PHOTOCHEMISTRY
ANIONS
HYDRATES
POTASSIUM COMPOUNDS
SULFURIC ACID
ULTRAVIOLET RADIATION
VERY LOW TEMPERATURE
ALKALI METAL COMPOUNDS
CHARGED PARTICLES
CHEMISTRY
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IONS
MOLYBDENUM COMPOUNDS
NONMETALS
OXYGEN COMPOUNDS
RADIATIONS
SPECTRA
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YIELDS
400500* - Photochemistry